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4 years ago

Why can polar water molecules pass through a cell membrane?

1 answer:

5 0

Through osmosis because the membrane is partially permeable, osmosis is the movement of water molecules from a region of lower solute concentration to a higher solute concentration.
is the answer

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A river with a flow of 50 m3/s discharges into a lake with a volume of 15,000,000 m3. The river has a background pollutant conce

spin [16.1K]

Explanation:

The given data is as follows.

Volume of lake = $15 \times 10^{6} m^{3}$ = $15 \times 10^{6} m^{3} \times \frac{10^{3} liter}{1 m^{3}}$

Concentration of lake = 5.6 mg/l

Total amount of pollutant present in lake = $5.6 \times 15 \times 10^{9} mg$

= $84 \times 10^{9}$ mg

= $84 \times 10^{3}$ kg

Flow rate of river is 50 $m^{3} sec^{-1}$

Volume of water in 1 day = $50 \times 10^{3} \times 86400 liter$

= $432 \times 10^{7}$ liter

Concentration of river is calculated as 5.6 mg/l. Total amount of pollutants present in the lake are $2.9792 \times 10^{10} mg$ or $2.9792 \times 10^{4} kg$

Flow rate of sewage = $0.7 m^{3} sec^{-1}$

Volume of sewage water in 1 day = $6048 \times 10^{4}$ liter

Concentration of sewage = 300 mg/L

Total amount of pollutants = $1.8144 \times 10^{10} mg$ or $1.8144 \times 10^{4}kg$

Therefore, total concentration of lake after 1 day = $\frac{131936 \times 10^{6}}{1.938 \times 10^{10}}mg/ l$

= 6.8078 mg/l

$k_{D}$ = 0.2 per day

$L_{o}$ = 6.8078

Hence, $L_{liquid}$ = $L_{o}(1 - e^{-k_{D}t}$

$L_{liquid}$ = $6.8078 (1 - e^{-0.2 \times 1})$

= 1.234 mg/l

Hence, the remaining concentration = (6.8078 - 1.234) mg/l

= 5.6 mg/l

Thus, we can conclude that concentration leaving the lake one day after the pollutant is added is 5.6 mg/l.

5 0

4 years ago

Which property determine am atoms ability to attract electrons shared in a chemical bond?

brilliants [131]

Hello there!

Electronegativity is what determine's an atoms ability to attract electrons shared in a chemical bond.Ionization, atomic radius, and also ionic radius both would not determine this as they wouldn't have any similar bond that would attract.

Your correct answer would be (option c)

A. ionization

B. atomic radius

C. electronegativity

D. ionic radius

I hope this helps you!

8 0

3 years ago

Special characteristics of metals, like being shiny, are called A Descriptions B Phrases C Qualities D Properties

slega [8]

Answer:
d properties
i took a test on this before

8 0

3 years ago

Read 2 more answers

What is the relation between work done height mass and acceleration due to gravity

Zanzabum

Explanation:

Potential energy is the the relationship between work done height mass and acceleration due to gravity, because of this some objects also experience kinetic energy due to the factors mentioned above

6 0

1 year ago

The number of un paired electrons in the outer subshell of a cl atom is

Tatiana [17]

1 is the number of unpaired electrons in the outer subshell of a Cl atom

3 0

3 years ago